Update AppVeyor

Added debug artifact for debugging purpose.

Signed-off-by: Syrone Wong <wong.syrone@gmail.com>

README.md

@@ -72,8 +72,8 @@ Visual Studio 2015 is required.
 GPLv3
 
 
-[Appveyor]:       https://ci.appveyor.com/project/icylogic/shadowsocks-windows-l9mwe
-[Build Status]:   https://ci.appveyor.com/api/projects/status/ytllr9yjkbpc2tu2/branch/master
+[Appveyor]:       https://ci.appveyor.com/project/wongsyrone/shadowsocks-windows-0cn3i
+[Build Status]:   https://ci.appveyor.com/api/projects/status/47784ryn365vw56w/branch/master?svg=true
 [latest release]: https://github.com/shadowsocks/shadowsocks-csharp/releases
 [GFWList]:        https://github.com/gfwlist/gfwlist
 [Servers]:        https://github.com/shadowsocks/shadowsocks/wiki/Ports-and-Clients#linux--server-side